Internal expanding brake.



Patented Feb. 18, 1919.

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INTERNAL EXPANDING BRAKE.

APPLICATION FILED JUNE 24. 19134 Patented Feb. 18, 1919.

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s inn 8 f v G av k 3 T 0 nested 32: be l'eadi J2 L1 J. L413 Lher as 19 suppo Wit} liners m inner term 11 1s 1 the sald brackets Washers or baneatb. ths spraad 3% the by Th p 3'50? a 5 61 5 brake shaes' 41; connectm wherel nectmg tpram-mm All?! and, 2 are adapted t0 1y sonnet said ada oiea anti 3 as the minals or lugs 20 and fixed to the axle housing between the said terminals is an attaching clip 21 for the brake shoes. This clip is shown in detail in Fig. 3 of the drawings and as there illustrated is preferably formed from a strip of substantially U-shape to provide parallel clip arms. Extending loosely through said arms and through the adjacent end of the housing 12 at the rear side thereof, is a bolt or other suitable fastening device 22, securing the clip within the housing; Struck from opposite edges of the clip arms adjacent their inner extremities are lateral spurs 23 and snugly fitting within the bight of the clip is a supporting pin 2% for the brake shoes having indentations receiving the said spurs. This pin, as shown in both Figs. 1 and 2 of the drawings, extends at substantially right angles to the bolt 22 to project beyond the side edges of the clip in chordal relation to the brake shoes and, as will now be clear, the said bolt may be adjusted for binding the clip against the adjacent .end of the housing to hold the clip fixed and, at the same time, flexing the arms of the clip to impinge the spurs 23 thereagainst and. tightly clamp the pin within the clip. The pin will thus berigidly held against longitudinal movement with respect to the clip for receiving the terminals 20 of the brake shoes which are loosely fitted upon opposite ends of the said pin. Thus the pin will operatively support the brake shoes at their inner ends.

Connected to the inner end portions of the brake shoes are brackets 25. These brackets are preferably formed from a strip of suitable resilient sheet metal bent to provide arms 26 at the inner ends of the brackets and lugs 27 at the outer ends of the brackets. The intermediate portions of the brackets are curved to lit the inner side faces of the brake shoes and are secured thereto by rivets 'or other suitable fastening devices so that inwardly the bracket arms project radially Fig. 2 of from the shoes. As best shown in the drawings, the bracket arms 26 are disposed in spaced parallel relation to the terminals 20 of the brake shoes and these arms are formed with suitable openings loosely receiving the ends of the pin 24: there through. Removably fitted upon the opposite ends of the pin and interposed between the bracket arms 26 and the terminals, are

1 a plurality of washers .or liners 28 held detachabiy against displacement from the pin by the said bracket arms. The purpose of these was "s will. presently appear. The lugs 2? rackets project beyond the bight of .ching clip 21 and engaged with the ends of the said lugs is a helicalspring 29 extending between the lugs and formed at its ends with rebent portions or hooks engaging through suitable opensuitable sheet metal bent into of the shoes and ings in the lugs. As will be clear, this spring will thus act to yieldably connect the brake shoes at their inner ends and hold the terminals 20 thereof engaged upon the supporting pin 24;.

Formed on the brake shoes, at their outer ends, are inwardly directed radial lugs 30 adapted to cotiperate with the cam 15 and connected to the adjacent end portions of the shoes are anchoring plates 31. These plates are mounted upon the inner side faces of the shoes to be secured thereto by rivets or other suitable fastening devices and extending between the plates is a helical spring 32 formed at its ends with rebent portions or hooks detachably engaging through suitable openings in the free ends of the plates. Thus, the spring 32 will yieldably connect the bra e shoes at their outer ends and act upon the said shoes to hold the lugs 30 thereof engaging againstthe cam 15. Consequently, when the brake rod 17 is actuated to rock the cam, the cam will act against these lugs for expanding the shoes and shifting the brake linings into engagement with the drum for applying the brake. Upon the release of the brake rod, said spring will, of course, immediately act to retract the moss.

As will now be observed, the clip 21 will, when the brake linings are new, space the inner ends of the brake shoes apart in such manner that the said linings will properly cooperate with the brake drum. However, the brake linings will, of course, wear away. For taking up such wear, the terminals 20 of the brake shoes may simply be slidably shifted from the ends of the supporting pin 24: against the tension of the spring 29 and one or more of the washers 28 removedfrom the position shown in Fig. the pin, as shown in detail in Fig. 4:, between the said terminals and the clip for spreading the shoes at their inner ends. The-purpose of these washers now becomes apparent and, as also shown in not being used between the inner terminals the clip, may beretained upon the pin between the bracket arms 26 and the said terminals,'to beheld against displacement from the pin by the said arms.

I accordingly provide a fective arrangement for the brake shoes and by arms 26 for'holding a supply of the washers upon the supporting in for the shoes, these washers will always iently at hand while, said washers may be with a minimum of dilhculty.

Having thus described the invention, what is claimed as new is: 4

1. An internal expanding brake including companion brake shoes, supporting means for the shoes, means holding the shoes upon very simple and eftaking up wear in at the same time, the

employing the clip removed from the pin- 2 and fitted upon r Fig. 4', any of the washers e maintained convensaid supporting means and adapted to permit the spreading of the shoes whereby liners may be disposed beneath the inner ends of the shoes for maintaining the shoes spread, means carried by the brake shoes to coaot with said supporting means and adapted to normally retain a supply of liners inactive upon the said supporting means, and service means for expanding the said shoes.

2. An internal expanding brake including companion brake shoes, means supporting the said shoes, yieldable means connecting the shoes whereby liners may be interposed beneath 'the inner ends of the shoes for spreading the said shoes, means carried by the shoes to coact. with said supporting means and adapted to retain a supply of liners inactive upon the said sup orting means, and service means fo expan ing the said shoes.

3. An internal expanding brake including companion brake shoes, means iupporting the said shoes, means holding the shoes upon said supporting means and adapted to permit the spreading of the shoes whereby liners may be interposed beneath the inner ends of the shoes for maintaining the shoes spread, means carried by the shoes to slidably fit over said supporting means and adapted to retain a supply of liners inactive upon the said supporting means, and service means for expanding the said shoes.

4. An internal ex anding brake including companion brake s oes, means supporting the said shoes, means carried by the shoes to coact With said supporting means for retaining. a supply of liners inactive upon the said supporting means, means carried by said second ment oned means and holding the shoes upon said supporting means, the said last mentioned means being adapted to permit the spreading of the shoes whereby liners may be interposed beneath the inner ends of the shoes for maintaining the shoes spread, and service means shoes.

5. An internal expanding brake including companion brake shoes, means supporting the said shoes, brackets carried by the shoes to coact with said supporting means for retaining a supply of liners inactive upon said supporting means, yieldable means holding the shoes upon said supporting means Whereby liners may be interposed beneath the inner ends of the shoes for spreading the for expanding the said shoes, and service means for expanding the said shoes.

6. An internal expanding brake including companion brake shoes, means supporting the said shoes, brackets connected to the shoes and having arms fitting over said supporting means and adapted to retain a sup ply of liners inactive upon said supporting means, lugs formed on the brackets, yieldable means extending between said lugs and acting to hold the shoes upon said supporting means whereby liners may be interposed beneath the inner ends of the shoes for spreading the shoes, and service means for I expanding the said shoes.

7. An internal expanding brake including.

ing the shoes, and yieldable means for bold supporting means and adapted to permit the spreading of the shoes upon the supporting.

means toward the ends thereof.

9. An internal expanding brake including companion brake shoes, supporting means therefor, liners normally carried inactive upon the supporting means, and means carried by the brake shoes and holding the liners against displacement from the supportingmeans, the liners being insertible beneath the inner ends of the shoes for spreading the shoes.

10. An internal expanding brake including companion brake shoes, supporting i106 means therefor, liners normally carried inactive upon the supporting means, and means carried by the brake shoes and engaging yieldable means holding said shoe.

ing the shoes against displacement from the over the ends. of the supporting means for holding the liners against displacement therefrom, the liners being insertible beneath the inner ends of the shoes for spreading the shoes.

In testimony whereof I ailix In signature.

JOSEPH O. MICHAUl [1,. s.] 

